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<div class="titlepage"><div><div><h5 class="title">
<a name="geometry.reference.algorithms.buffer.buffer_4"></a><a class="link" href="buffer_4.html" title="buffer">buffer</a>
</h5></div></div></div>
<p>
            <a class="indexterm" name="idm24897"></a>
Calculates the buffer of a geometry.
          </p>
<h6>
<a name="geometry.reference.algorithms.buffer.buffer_4.h0"></a>
            <span class="phrase"><a name="geometry.reference.algorithms.buffer.buffer_4.description"></a></span><a class="link" href="buffer_4.html#geometry.reference.algorithms.buffer.buffer_4.description">Description</a>
          </h6>
<p>
            The free function buffer calculates the buffer (a polygon being the spatial
            point set collection within a specified maximum distance from a geometry)
            of a geometry.
          </p>
<h6>
<a name="geometry.reference.algorithms.buffer.buffer_4.h1"></a>
            <span class="phrase"><a name="geometry.reference.algorithms.buffer.buffer_4.synopsis"></a></span><a class="link" href="buffer_4.html#geometry.reference.algorithms.buffer.buffer_4.synopsis">Synopsis</a>
          </h6>
<p>
</p>
<pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Input</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Output</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Distance</span><span class="special">&gt;</span>
<span class="keyword">void</span> <span class="identifier">buffer</span><span class="special">(</span><span class="identifier">Input</span> <span class="keyword">const</span> <span class="special">&amp;</span> <span class="identifier">geometry_in</span><span class="special">,</span> <span class="identifier">Output</span> <span class="special">&amp;</span> <span class="identifier">geometry_out</span><span class="special">,</span> <span class="identifier">Distance</span> <span class="keyword">const</span> <span class="special">&amp;</span> <span class="identifier">distance</span><span class="special">,</span>
            <span class="identifier">Distance</span> <span class="keyword">const</span> <span class="special">&amp;</span> <span class="identifier">chord_length</span> <span class="special">=</span> <span class="special">-</span><span class="number">1</span><span class="special">)</span></pre>
<p>
          </p>
<h6>
<a name="geometry.reference.algorithms.buffer.buffer_4.h2"></a>
            <span class="phrase"><a name="geometry.reference.algorithms.buffer.buffer_4.parameters"></a></span><a class="link" href="buffer_4.html#geometry.reference.algorithms.buffer.buffer_4.parameters">Parameters</a>
          </h6>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                    <p>
                      Type
                    </p>
                  </th>
<th>
                    <p>
                      Concept
                    </p>
                  </th>
<th>
                    <p>
                      Name
                    </p>
                  </th>
<th>
                    <p>
                      Description
                    </p>
                  </th>
</tr></thead>
<tbody>
<tr>
<td>
                    <p>
                      Input const &amp;
                    </p>
                  </td>
<td>
                    <p>
                      Any type fulfilling a Geometry Concept
                    </p>
                  </td>
<td>
                    <p>
                      geometry_in
                    </p>
                  </td>
<td>
                    <p>
                      A model of the specified concept
                    </p>
                  </td>
</tr>
<tr>
<td>
                    <p>
                      Output &amp;
                    </p>
                  </td>
<td>
                    <p>
                      Any type fulfilling a Geometry Concept
                    </p>
                  </td>
<td>
                    <p>
                      geometry_out
                    </p>
                  </td>
<td>
                    <p>
                      A model of the specified concept
                    </p>
                  </td>
</tr>
<tr>
<td>
                    <p>
                      Distance const &amp;
                    </p>
                  </td>
<td>
                    <p>
                      numerical type (int, double, ttmath, ...)
                    </p>
                  </td>
<td>
                    <p>
                      distance
                    </p>
                  </td>
<td>
                    <p>
                      The distance to be used for the buffer
                    </p>
                  </td>
</tr>
<tr>
<td>
                    <p>
                      Distance const &amp;
                    </p>
                  </td>
<td>
                    <p>
                      numerical type (int, double, ttmath, ...)
                    </p>
                  </td>
<td>
                    <p>
                      chord_length
                    </p>
                  </td>
<td>
                    <p>
                      (optional) The length of the chord's in the generated arcs
                      around points or bends
                    </p>
                  </td>
</tr>
</tbody>
</table></div>
<h6>
<a name="geometry.reference.algorithms.buffer.buffer_4.h3"></a>
            <span class="phrase"><a name="geometry.reference.algorithms.buffer.buffer_4.header"></a></span><a class="link" href="buffer_4.html#geometry.reference.algorithms.buffer.buffer_4.header">Header</a>
          </h6>
<p>
            Either
          </p>
<p>
            <code class="computeroutput"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">geometry</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
          </p>
<p>
            Or
          </p>
<p>
            <code class="computeroutput"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">geometry</span><span class="special">/</span><span class="identifier">algorithms</span><span class="special">/</span><span class="identifier">buffer</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
          </p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>
              This version without strategies enlarges a box. To buffer any geometry,
              use <a class="link" href="buffer_7_with_strategies.html" title="buffer (with strategies)">buffer
              (with strategies)</a>
            </p></td></tr>
</table></div>
<h6>
<a name="geometry.reference.algorithms.buffer.buffer_4.h4"></a>
            <span class="phrase"><a name="geometry.reference.algorithms.buffer.buffer_4.behavior"></a></span><a class="link" href="buffer_4.html#geometry.reference.algorithms.buffer.buffer_4.behavior">Behavior</a>
          </h6>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                    <p>
                      Case
                    </p>
                  </th>
<th>
                    <p>
                      Behavior
                    </p>
                  </th>
</tr></thead>
<tbody><tr>
<td>
                    <p>
                      Box/Box
                    </p>
                  </td>
<td>
                    <p>
                      Returns a new rectangular box, enlarged with the specified
                      distance. It is allowed that "geometry_out" the same
                      object as "geometry_in"
                    </p>
                  </td>
</tr></tbody>
</table></div>
</div>
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<td align="right"><div class="copyright-footer">Copyright © 2009-2021 Barend Gehrels,
      Bruno Lalande, Mateusz Loskot, Adam Wulkiewicz, Oracle and/or its affiliates<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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